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Merge changes I7b0afb0d,I7ecc9708

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* changes:
  Get rid of image_info_ from WebPChunk struct.
  WebP Container Spec:
This commit is contained in:
pascal massimino 2012-07-04 16:32:29 -07:00 committed by Gerrit Code Review
commit 1bd7dd5097
5 changed files with 117 additions and 129 deletions
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8
doc/webp-container-spec.txt
View File

@ -286,10 +286,10 @@ An extended format file consists of:
* An optional 'META' chunk with metadata.
As will be described in the 'VP8X' chunk description, by checking a
flag one can distinguish animated and non-animated images. A
non-animated image has exactly one frame. An animated one may have
multiple frames. Data for each frame consists of:
A file MUST contain at least one frame. As will be described in the 'VP8X'
chunk description, by checking a flag one can distinguish animated and
non-animated images. A non-animated image has exactly one frame. An animated
one may have multiple frames. Data for each frame consists of:
* An optional 'FRM ' (fourth character is a significant space) chunk
with animation frame metadata. It MUST be present in animated

201
src/mux/muxedit.c
View File

@ -17,6 +17,15 @@
extern "C" {
#endif
// Object to store metadata about images.
typedef struct {
uint32_t x_offset_;
uint32_t y_offset_;
uint32_t duration_;
uint32_t width_;
uint32_t height_;
} WebPImageInfo;
//------------------------------------------------------------------------------
// Life of a mux object.
@ -61,8 +70,7 @@ void WebPMuxDelete(WebPMux* const mux) {
// Handy MACRO, makes MuxSet() very symmetric to MuxGet().
#define SWITCH_ID_LIST(INDEX, LIST) \
if (idx == (INDEX)) { \
err = ChunkAssignDataImageInfo(&chunk, data, image_info, copy_data, \
kChunks[(INDEX)].tag); \
err = ChunkAssignData(&chunk, data, copy_data, kChunks[(INDEX)].tag); \
if (err == WEBP_MUX_OK) { \
err = ChunkSetNth(&chunk, (LIST), nth); \
} \
@ -70,8 +78,7 @@ void WebPMuxDelete(WebPMux* const mux) {
}
static WebPMuxError MuxSet(WebPMux* const mux, CHUNK_INDEX idx, uint32_t nth,
const WebPData* const data,
WebPImageInfo* image_info, int copy_data) {
const WebPData* const data, int copy_data) {
WebPChunk chunk;
WebPMuxError err = WEBP_MUX_NOT_FOUND;
assert(mux != NULL);
@ -86,8 +93,7 @@ static WebPMuxError MuxSet(WebPMux* const mux, CHUNK_INDEX idx, uint32_t nth,
// For raw-data unknown chunk, the first four bytes should be the tag to be
// used for the chunk.
const WebPData tmp = { data->bytes_ + TAG_SIZE, data->size_ - TAG_SIZE };
err = ChunkAssignDataImageInfo(&chunk, &tmp, image_info, copy_data,
GetLE32(data->bytes_ + 0));
err = ChunkAssignData(&chunk, &tmp, copy_data, GetLE32(data->bytes_ + 0));
if (err == WEBP_MUX_OK)
err = ChunkSetNth(&chunk, &mux->unknown_, nth);
}
@ -97,73 +103,46 @@ static WebPMuxError MuxSet(WebPMux* const mux, CHUNK_INDEX idx, uint32_t nth,
static WebPMuxError MuxAddChunk(WebPMux* const mux, uint32_t nth, uint32_t tag,
const uint8_t* data, size_t size,
WebPImageInfo* image_info, int copy_data) {
int copy_data) {
const CHUNK_INDEX idx = ChunkGetIndexFromTag(tag);
const WebPData chunk_data = { data, size };
assert(mux != NULL);
assert(size <= MAX_CHUNK_PAYLOAD);
if (idx == IDX_NIL) return WEBP_MUX_INVALID_PARAMETER;
return MuxSet(mux, idx, nth, &chunk_data, image_info, copy_data);
return MuxSet(mux, idx, nth, &chunk_data, copy_data);
}
static void InitImageInfo(WebPImageInfo* const image_info) {
assert(image_info);
memset(image_info, 0, sizeof(*image_info));
}
// Creates WebPImageInfo object and sets offsets, dimensions and duration.
// Dimensions calculated from passed VP8/VP8L image data.
static WebPImageInfo* CreateImageInfo(uint32_t x_offset, uint32_t y_offset,
uint32_t duration,
const WebPData* const image_data,
int is_lossless) {
// Create data for frame/tile given image data, offsets and duration.
static WebPMuxError CreateFrameTileData(const WebPData* const image,
uint32_t x_offset, uint32_t y_offset,
uint32_t duration, int is_lossless,
int is_frame,
WebPData* const frame_tile) {
int width;
int height;
WebPImageInfo* image_info = NULL;
const uint8_t* const data = image_data->bytes_;
const size_t size = image_data->size_;
uint8_t* frame_tile_bytes;
const size_t frame_tile_size = kChunks[is_frame ? IDX_FRAME : IDX_TILE].size;
const int ok = is_lossless ?
VP8LGetInfo(data, size, &width, &height, NULL) :
VP8GetInfo(data, size, size, &width, &height);
if (!ok) return NULL;
VP8LGetInfo(image->bytes_, image->size_, &width, &height, NULL) :
VP8GetInfo(image->bytes_, image->size_, image->size_, &width, &height);
if (!ok) return WEBP_MUX_INVALID_ARGUMENT;
image_info = (WebPImageInfo*)malloc(sizeof(WebPImageInfo));
if (image_info != NULL) {
InitImageInfo(image_info);
image_info->x_offset_ = x_offset;
image_info->y_offset_ = y_offset;
image_info->duration_ = duration;
image_info->width_ = width;
image_info->height_ = height;
}
frame_tile_bytes = (uint8_t*)malloc(frame_tile_size);
if (frame_tile_bytes == NULL) return WEBP_MUX_MEMORY_ERROR;
return image_info;
}
// Create data for frame/tile given image_info.
static WebPMuxError CreateDataFromImageInfo(const WebPImageInfo* image_info,
int is_frame,
uint8_t** const data,
size_t* const size) {
assert(data);
assert(size);
assert(image_info);
*size = kChunks[is_frame ? IDX_FRAME : IDX_TILE].size;
*data = (uint8_t*)malloc(*size);
if (*data == NULL) return WEBP_MUX_MEMORY_ERROR;
// Fill in data according to frame/tile chunk format.
PutLE32(*data + 0, image_info->x_offset_);
PutLE32(*data + 4, image_info->y_offset_);
PutLE32(frame_tile_bytes + 0, x_offset);
PutLE32(frame_tile_bytes + 4, y_offset);
if (is_frame) {
PutLE32(*data + 8, image_info->width_);
PutLE32(*data + 12, image_info->height_);
PutLE32(*data + 16, image_info->duration_);
PutLE32(frame_tile_bytes + 8, (uint32_t)width);
PutLE32(frame_tile_bytes + 12, (uint32_t)height);
PutLE32(frame_tile_bytes + 16, duration);
}
frame_tile->bytes_ = frame_tile_bytes;
frame_tile->size_ = frame_tile_size;
return WEBP_MUX_OK;
}
@ -258,8 +237,7 @@ WebPMuxError WebPMuxSetImage(WebPMux* const mux,
if (alpha.bytes_ != NULL) { // Add alpha chunk.
ChunkInit(&chunk);
err = ChunkAssignDataImageInfo(&chunk, &alpha, NULL, copy_data,
kChunks[IDX_ALPHA].tag);
err = ChunkAssignData(&chunk, &alpha, copy_data, kChunks[IDX_ALPHA].tag);
if (err != WEBP_MUX_OK) goto Err;
err = ChunkSetNth(&chunk, &wpi.alpha_, 1);
if (err != WEBP_MUX_OK) goto Err;
@ -267,7 +245,7 @@ WebPMuxError WebPMuxSetImage(WebPMux* const mux,
// Add image chunk.
ChunkInit(&chunk);
err = ChunkAssignDataImageInfo(&chunk, &image, NULL, copy_data, image_tag);
err = ChunkAssignData(&chunk, &image, copy_data, image_tag);
if (err != WEBP_MUX_OK) goto Err;
err = ChunkSetNth(&chunk, &wpi.img_, 1);
if (err != WEBP_MUX_OK) goto Err;
@ -301,7 +279,7 @@ WebPMuxError WebPMuxSetMetadata(WebPMux* const mux,
if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err;
// Add the given metadata chunk.
return MuxSet(mux, IDX_META, 1, metadata, NULL, copy_data);
return MuxSet(mux, IDX_META, 1, metadata, copy_data);
}
WebPMuxError WebPMuxSetColorProfile(WebPMux* const mux,
@ -319,7 +297,7 @@ WebPMuxError WebPMuxSetColorProfile(WebPMux* const mux,
if (err != WEBP_MUX_OK && err != WEBP_MUX_NOT_FOUND) return err;
// Add the given ICCP chunk.
return MuxSet(mux, IDX_ICCP, 1, color_profile, NULL, copy_data);
return MuxSet(mux, IDX_ICCP, 1, color_profile, copy_data);
}
WebPMuxError WebPMuxSetLoopCount(WebPMux* const mux, uint32_t loop_count) {
@ -338,7 +316,7 @@ WebPMuxError WebPMuxSetLoopCount(WebPMux* const mux, uint32_t loop_count) {
PutLE32(data, loop_count);
err = MuxAddChunk(mux, 1, kChunks[IDX_LOOP].tag, data,
kChunks[IDX_LOOP].size, NULL, 1);
kChunks[IDX_LOOP].size, 1);
free(data);
return err;
}
@ -351,9 +329,6 @@ static WebPMuxError MuxPushFrameTileInternal(
WebPData alpha;
WebPMuxImage wpi;
WebPMuxError err;
WebPImageInfo* image_info = NULL;
uint8_t* frame_tile_data = NULL;
size_t frame_tile_size = 0;
WebPData frame_tile;
const int is_frame = (tag == kChunks[IDX_FRAME].tag) ? 1 : 0;
int is_lossless;
@ -370,48 +345,35 @@ static WebPMuxError MuxPushFrameTileInternal(
if (err != WEBP_MUX_OK) return err;
image_tag = is_lossless ? kChunks[IDX_VP8L].tag : kChunks[IDX_VP8].tag;
memset(&frame_tile, 0, sizeof(frame_tile));
ChunkInit(&chunk);
MuxImageInit(&wpi);
if (alpha.bytes_ != NULL) {
// Add alpha chunk.
err = ChunkAssignDataImageInfo(&chunk, &alpha, NULL, copy_data,
kChunks[IDX_ALPHA].tag);
err = ChunkAssignData(&chunk, &alpha, copy_data, kChunks[IDX_ALPHA].tag);
if (err != WEBP_MUX_OK) goto Err;
err = ChunkSetNth(&chunk, &wpi.alpha_, 1);
if (err != WEBP_MUX_OK) goto Err;
ChunkInit(&chunk); // chunk owned by wpi.alpha_ now.
}
// Create image_info object.
image_info = CreateImageInfo(x_offset, y_offset, duration, &image,
is_lossless);
if (image_info == NULL) {
err = WEBP_MUX_MEMORY_ERROR;
goto Err;
}
// Add image chunk.
err = ChunkAssignDataImageInfo(&chunk, &image, image_info, copy_data,
image_tag);
err = ChunkAssignData(&chunk, &image, copy_data, image_tag);
if (err != WEBP_MUX_OK) goto Err;
image_info = NULL; // Owned by 'chunk' now.
err = ChunkSetNth(&chunk, &wpi.img_, 1);
if (err != WEBP_MUX_OK) goto Err;
ChunkInit(&chunk); // chunk owned by wpi.img_ now.
// Create frame/tile data from image_info.
err = CreateDataFromImageInfo(wpi.img_->image_info_, is_frame,
&frame_tile_data, &frame_tile_size);
// Create frame/tile data.
err = CreateFrameTileData(&image, x_offset, y_offset, duration, is_lossless,
is_frame, &frame_tile);
if (err != WEBP_MUX_OK) goto Err;
// Add frame/tile chunk (with copy_data = 1).
frame_tile.bytes_ = frame_tile_data;
frame_tile.size_ = frame_tile_size;
err = ChunkAssignDataImageInfo(&chunk, &frame_tile, NULL, 1, tag);
err = ChunkAssignData(&chunk, &frame_tile, 1, tag);
if (err != WEBP_MUX_OK) goto Err;
free(frame_tile_data);
frame_tile_data = NULL;
WebPDataClear(&frame_tile);
err = ChunkSetNth(&chunk, &wpi.header_, 1);
if (err != WEBP_MUX_OK) goto Err;
ChunkInit(&chunk); // chunk owned by wpi.header_ now.
@ -424,8 +386,7 @@ static WebPMuxError MuxPushFrameTileInternal(
return WEBP_MUX_OK;
Err: // Something bad happened.
free(image_info);
free(frame_tile_data);
WebPDataClear(&frame_tile);
ChunkRelease(&chunk);
MuxImageRelease(&wpi);
return err;
@ -492,6 +453,25 @@ WebPMuxError WebPMuxDeleteTile(WebPMux* const mux, uint32_t nth) {
//------------------------------------------------------------------------------
// Assembly of the WebP RIFF file.
static WebPMuxError GetFrameTileInfo(const WebPChunk* const frame_tile_chunk,
uint32_t* const x_offset,
uint32_t* const y_offset,
uint32_t* const duration) {
const uint32_t tag = frame_tile_chunk->tag_;
const int is_frame = (tag == kChunks[IDX_FRAME].tag);
const WebPData* const data = &frame_tile_chunk->data_;
const size_t expected_data_size =
is_frame ? FRAME_CHUNK_SIZE : TILE_CHUNK_SIZE;
assert(frame_tile_chunk != NULL);
assert(tag == kChunks[IDX_FRAME].tag || tag == kChunks[IDX_TILE].tag);
if (data->size_ != expected_data_size) return WEBP_MUX_INVALID_ARGUMENT;
*x_offset = GetLE32(data->bytes_ + 0);
*y_offset = GetLE32(data->bytes_ + 4);
if (is_frame) *duration = GetLE32(data->bytes_ + 16);
return WEBP_MUX_OK;
}
WebPMuxError MuxGetImageWidthHeight(const WebPChunk* const image_chunk,
int* const width, int* const height) {
const uint32_t tag = image_chunk->tag_;
@ -512,6 +492,33 @@ WebPMuxError MuxGetImageWidthHeight(const WebPChunk* const image_chunk,
}
}
static WebPMuxError GetImageInfo(const WebPMuxImage* const wpi,
WebPImageInfo* const image_info) {
const WebPChunk* const image_chunk = wpi->img_;
const WebPChunk* const frame_tile_chunk = wpi->header_;
WebPMuxError err;
uint32_t x_offset, y_offset, duration;
int width, height;
memset(image_info, 0, sizeof(*image_info));
// Get offsets and duration from FRM/TILE chunk.
err = GetFrameTileInfo(frame_tile_chunk, &x_offset, &y_offset, &duration);
if (err != WEBP_MUX_OK) return err;
// Get width and height from VP8/VP8L chunk.
err = MuxGetImageWidthHeight(image_chunk, &width, &height);
if (err != WEBP_MUX_OK) return err;
// All OK: fill up image_info.
image_info->x_offset_ = x_offset;
image_info->y_offset_ = y_offset;
image_info->duration_ = duration;
image_info->width_ = width;
image_info->height_ = height;
return WEBP_MUX_OK;
}
static WebPMuxError GetImageCanvasWidthHeight(
const WebPMux* const mux,
uint32_t flags, uint32_t* width, uint32_t* height) {
@ -529,21 +536,21 @@ static WebPMuxError GetImageCanvasWidthHeight(
uint64_t image_area = 0;
// Aggregate the bounding box for animation frames & tiled images.
for (; wpi != NULL; wpi = wpi->next_) {
const WebPImageInfo* image_info = wpi->img_->image_info_;
WebPImageInfo image_info;
const WebPMuxError err = GetImageInfo(wpi, &image_info);
const uint32_t max_x_pos = image_info.x_offset_ + image_info.width_;
const uint32_t max_y_pos = image_info.y_offset_ + image_info.height_;
if (err != WEBP_MUX_OK) return err;
if (image_info != NULL) {
const uint32_t max_x_pos = image_info->x_offset_ + image_info->width_;
const uint32_t max_y_pos = image_info->y_offset_ + image_info->height_;
if (max_x_pos < image_info->x_offset_) { // Overflow occurred.
if (max_x_pos < image_info.x_offset_) { // Overflow occurred.
return WEBP_MUX_INVALID_ARGUMENT;
}
if (max_y_pos < image_info->y_offset_) { // Overflow occurred.
if (max_y_pos < image_info.y_offset_) { // Overflow occurred.
return WEBP_MUX_INVALID_ARGUMENT;
}
if (max_x_pos > max_x) max_x = max_x_pos;
if (max_y_pos > max_y) max_y = max_y_pos;
image_area += (image_info->width_ * image_info->height_);
}
image_area += (image_info.width_ * image_info.height_);
}
*width = max_x;
*height = max_y;
@ -637,7 +644,7 @@ static WebPMuxError CreateVP8XChunk(WebPMux* const mux) {
PutLE24(data + 4, width - 1); // canvas width.
PutLE24(data + 7, height - 1); // canvas height.
err = MuxAddChunk(mux, 1, kChunks[IDX_VP8X].tag, data, data_size, NULL, 1);
err = MuxAddChunk(mux, 1, kChunks[IDX_VP8X].tag, data, data_size, 1);
return err;
}

16
src/mux/muxi.h
View File

@ -25,20 +25,10 @@ extern "C" {
//------------------------------------------------------------------------------
// Defines and constants.
// Object to store metadata about images.
typedef struct {
uint32_t x_offset_;
uint32_t y_offset_;
uint32_t duration_;
uint32_t width_;
uint32_t height_;
} WebPImageInfo;
// Chunk object.
typedef struct WebPChunk WebPChunk;
struct WebPChunk {
uint32_t tag_;
WebPImageInfo* image_info_;
int owner_; // True if *data_ memory is owned internally.
// VP8X, Loop, and other internally created chunks
// like frame/tile are always owned.
@ -143,10 +133,8 @@ WebPChunkId ChunkGetIdFromTag(uint32_t tag);
// nth = 0 means "last of the list".
WebPChunk* ChunkSearchList(WebPChunk* first, uint32_t nth, uint32_t tag);
// Fill the chunk with the given data & image_info.
WebPMuxError ChunkAssignDataImageInfo(WebPChunk* chunk,
const WebPData* const data,
WebPImageInfo* image_info,
// Fill the chunk with the given data.
WebPMuxError ChunkAssignData(WebPChunk* chunk, const WebPData* const data,
int copy_data, uint32_t tag);
// Sets 'chunk' at nth position in the 'chunk_list'.

9
src/mux/muxinternal.c
View File

@ -46,7 +46,6 @@ void ChunkInit(WebPChunk* const chunk) {
WebPChunk* ChunkRelease(WebPChunk* const chunk) {
WebPChunk* next;
if (chunk == NULL) return NULL;
free(chunk->image_info_);
if (chunk->owner_) {
WebPDataClear(&chunk->data_);
}
@ -122,9 +121,7 @@ static int ChunkSearchListToSet(WebPChunk** chunk_list, uint32_t nth,
//------------------------------------------------------------------------------
// Chunk writer methods.
WebPMuxError ChunkAssignDataImageInfo(WebPChunk* chunk,
const WebPData* const data,
WebPImageInfo* image_info,
WebPMuxError ChunkAssignData(WebPChunk* chunk, const WebPData* const data,
int copy_data, uint32_t tag) {
// For internally allocated chunks, always copy data & make it owner of data.
if (tag == kChunks[IDX_VP8X].tag || tag == kChunks[IDX_LOOP].tag) {
@ -149,10 +146,6 @@ WebPMuxError ChunkAssignDataImageInfo(WebPChunk* chunk,
}
}
if (tag == kChunks[IDX_VP8].tag || tag == kChunks[IDX_VP8L].tag) {
chunk->image_info_ = image_info;
}
chunk->tag_ = tag;
return WEBP_MUX_OK;

12
src/mux/muxread.c
View File

@ -48,9 +48,10 @@ static WebPMuxError MuxGet(const WebPMux* const mux, CHUNK_INDEX idx,
}
#undef SWITCH_ID_LIST
// Fill the chunk with the given data, after verifying that the data size
// doesn't exceed 'max_size'.
static WebPMuxError ChunkAssignData(WebPChunk* chunk, const uint8_t* data,
// Fill the chunk with the given data (includes chunk header bytes), after some
// verifications.
static WebPMuxError ChunkVerifyAndAssignData(WebPChunk* chunk,
const uint8_t* data,
size_t data_size, size_t riff_size,
int copy_data) {
uint32_t chunk_size;
@ -69,8 +70,7 @@ static WebPMuxError ChunkAssignData(WebPChunk* chunk, const uint8_t* data,
// Data assignment.
chunk_data.bytes_ = data + CHUNK_HEADER_SIZE;
chunk_data.size_ = chunk_size;
return ChunkAssignDataImageInfo(chunk, &chunk_data, NULL, copy_data,
GetLE32(data + 0));
return ChunkAssignData(chunk, &chunk_data, copy_data, GetLE32(data + 0));
}
//------------------------------------------------------------------------------
@ -136,7 +136,7 @@ WebPMux* WebPMuxCreateInternal(const WebPData* const bitstream, int copy_data,
WebPChunkId id;
WebPMuxError err;
err = ChunkAssignData(&chunk, data, size, riff_size, copy_data);
err = ChunkVerifyAndAssignData(&chunk, data, size, riff_size, copy_data);
if (err != WEBP_MUX_OK) goto Err;
id = ChunkGetIdFromTag(chunk.tag_);